In the new film Divergent, Shailene Woodley plays Tris Prior, a teen who battles her worst fears in a post-apocalyptic world divided by factions.

In the movie, Theo James's character Four says, "Fear doesn't shut you down. It wakes you up." Indeed, facing one's greatest fears is a major theme of the Divergent series.

Woodley told PEOPLE, "The movie really taught me that there is just no room for fear. Zero ... I'm like Tris in that fear stimulates me in a way. If something is a little bit scary, I am going to do it, because I want the challenge. I want to see what my body and mind and heart can do."

In Divergent, Tris Prior has seven big things that scare her; Woodley shares three of her own fears below:

1. Submarines

Submarine off the Bahamas

Bates Littlehales / National Geographic / Getty

"Being submerged underwater in a submarine, I think that would be one [fear] of mine. Just the claustrophobia of being underwater. I grew up in the ocean and in lakes – so I am comfortable in the water and a good swimmer – but being in a submarine underwater sounds awful."

2. Outer Space

Still from Gravity

Warner Bros

"Space. No interest in going to space. It is so unknown."

3. Kate Winslet

Kate Winslet on February 9, 2012 in New York City

Michael N. Todaro / Getty

"She is such a powerhouse ... She is maybe the only actor I've ever acted against that I was intimidated by – not because of who she was, but just because she is so good as an actress."